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Add VectorUnshear().

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VectorUnshear uses the exact same shear vector to remove shear from a
sheared vector. ie with:
  VectorShear (shear, v, w);
  VectorUnshear (shear, w, x);
x == v within fp math limits.
This commit is contained in:
Bill Currie 2012-05-10 17:23:26 +09:00
parent bf38e6073e
commit 9a3206795e
1 changed files with 6 additions and 0 deletions
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6
include/QF/mathlib.h
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@ -123,6 +123,12 @@ extern const vec_t *const quat_origin;
(c)[1] = (b)[0] * (a)[0] + (b)[1]; \
(c)[0] = (b)[0]; \
} while (0)
#define VectorUnshear(a,b,c) \
do { \
(c)[2] = (b)[2] - (b)[1] * (a)[2] - (b)[0] * ((a)[1]-(a)[0]*(a)[2]); \
(c)[1] = (b)[1] - (b)[0] * (a)[0]; \
(c)[0] = (b)[0]; \
} while (0)
#define VectorCompMult(a,b,c) \
do { \
(c)[0] = (a)[0] * (b)[0]; \